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The world has hit a global warming milestone it may never recover from.
Scientists at the Mauna Loa Observatory in Hawaii announced in 2013 that atmospheric concentrations of carbon dioxide reached a daily average above 400 parts per million for the first time in history. CO2 concentrations “haven’t been this high in millions of years,” said scientist Erika Podest at the time.read more

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In May 2013, the carbon dioxide monitoring station at Mauna Loa, Hawaii, recorded a major milestone — the concentration of atmospheric carbon dioxide had crossed the symbolic “red line” of 400 parts per million for the first time si...

Here’s another excellent repost from Shrink That Footprint: By Lindsay Wilson The world reached a grim milestone recently, with atmospheric concentrations at the historic Mauna Loa observatory hitting the 400 parts per million mark ...

April 2014 was the first month in human history during which carbon dioxide in the air rose above an average 400 parts per million. The determination is based on atmospheric readings from an observatory in Mauna Loa, Hawaii. Accordi...

We have passed a grim new milestone for atmospheric carbon dioxide levels, probably for good. Earlier this week Mauna Loa Observatory, a key site for keeping tabs on carbon dioxide measured 400 parts […]

On May 9, the daily mean concentration of carbon dioxide in the atmosphere of Mauna Loa, Hawaii, surpassed 400 parts per million (ppm) for the first time since measurements began in 1958. Independent measurements made by both NOAA a...